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Carl Burtis and Edward Ashwood (eds.): Tietz Textbook of Clinical Chemistry.
3rd Ed., W.B. Saunders Co. Philadelphia, PA. 1999, p. 1827.
Arterial Blood Evaluation (Effect of pO
2
:
Performance with Arterial Specimens)
An arterial specimen study was performed at a hospital site.
Ascensia™ C
ONTOUR™ results from arterial samples were
compared to the site blood glucose method. The glucose
concentration of the samples ranged from 3.1 to 24.0
mmol/L, with an average of 8.5 mmol/L. The sample
hematocrit range was 22 to 58%, with an average of 39%.
The pO
2
values ranged from 43 to 205 mm Hg, with an
average of 104 mm Hg. The reference range for arterial pO
2
is 83 to 108 mm Hg (11.1 to 14.4 kPa)
1
. Mean biases were
–2.9% at pO
2
concentrations <83 mm Hg (n = 33, Mean
pO
2
= 71 mm Hg), –2.5% at pO
2
concentrations between 83
to 108 mm Hg (n = 40, Mean pO
2
= 94 mm Hg), and –0.8%
at pO
2
concentrations >108 mm Hg (n = 38, Mean pO
2
=
143 mm Hg). Two samples had glucose concentrations
<4.2 mmol/L and the bias was calculated as an absolute
difference rather than a percentage. These samples had
biases of –0.06 mmol/L and –0.44 mmol/L; pO
2
values were
80 and 112 mm Hg, respectively.
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